Shorts Under Armour Prototype Logo Shorts-Blu. Shorts Under Armour Prototype Logo Shorts-Blu. Boys' shorts in a loose cut made of a very light and smooth fabric that dares extremely quickly. This is helped by MTS technology that supports moisture removal to the material surface. Elastic waistband with lace to tighten. Side mesh pockets. Size YM (leg length from crotch): 21cm (+/- 3.5 cm per size). Technology: Moisture Transport - A special technology that takes sweat away from your body to the surface. This makes clothes dry better and keep athletes dry. Material: 100% Polyester